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29027fd1e1
Using pkgs.lib on the spine of module evaluation is problematic because the pkgs argument depends on the result of module evaluation. To prevent an infinite recursion, pkgs and some of the modules are evaluated twice, which is inefficient. Using ‘with lib’ prevents this problem.
77 lines
2.1 KiB
Nix
77 lines
2.1 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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let
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xcfg = config.services.xserver;
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cfg = xcfg.desktopManager;
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# If desktop manager `d' isn't capable of setting a background and
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# the xserver is enabled, the `feh' program is used as a fallback.
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needBGCond = d: ! (d ? bgSupport && d.bgSupport) && xcfg.enable;
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in
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{
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# Note: the order in which desktop manager modules are imported here
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# determines the default: later modules (if enabled) are preferred.
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# E.g., if KDE is enabled, it supersedes xterm.
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imports = [ ./none.nix ./xterm.nix ./xfce.nix ./kde4.nix ./e17.nix ./gnome3.nix ./xbmc.nix ];
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options = {
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services.xserver.desktopManager = {
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session = mkOption {
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internal = true;
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default = [];
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example = singleton
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{ name = "kde";
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bgSupport = true;
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start = "...";
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};
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description = ''
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Internal option used to add some common line to desktop manager
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scripts before forwarding the value to the
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<varname>displayManager</varname>.
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'';
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apply = list: {
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list = map (d: d // {
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manage = "desktop";
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start = d.start
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+ optionalString (needBGCond d) ''
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if test -e $HOME/.background-image; then
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${pkgs.feh}/bin/feh --bg-scale $HOME/.background-image
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fi
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'';
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}) list;
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needBGPackages = [] != filter needBGCond list;
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};
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};
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default = mkOption {
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type = types.str;
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default = "";
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example = "none";
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description = "Default desktop manager loaded if none have been chosen.";
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apply = defaultDM:
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if defaultDM == "" && cfg.session.list != [] then
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(head cfg.session.list).name
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else if any (w: w.name == defaultDM) cfg.session.list then
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defaultDM
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else
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throw "Default desktop manager ($(defaultDM)) not found.";
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};
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};
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};
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config = {
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services.xserver.displayManager.session = cfg.session.list;
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environment.systemPackages =
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mkIf cfg.session.needBGPackages [ pkgs.feh ];
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};
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}
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